Monitor



FIG. 1 is a perspective view of a monitor showing my new design in accordance with the invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The broken lines shown in the drawings form no part of the claimed design. 

The ornamental design for a monitor, as shown and described. 